From Google Operating System:
Google Reader lets you tag blogs and blog posts and share those items with your friends. You get a feed, a HTML page or a clip you can add to your site.
If you use the code from Google Reader, the clip will only show the titles of the latest items and a link to the source. Fortunately, Google Reader has a callback parameter that lets you add your JavaScript code that does more than the default features.
……..Here’s a very basic page that uses this code and another page from Google Code.